# Car pre-wash for stuck-on grime: AutoGrooming AutoGrooming Indigo Core - By Dasom (https://superchart.com/en/@pair-of-slippers/) - Written Aug 14, 2026 - Products › Home & living - Product provided: I received this product and used it. - English edition: https://superchart.com/en/@pair-of-slippers/agd-indigo-core-prewash-car-cleaning/ - Also in: [한국어](https://superchart.com/ko/@pair-of-slippers/agd-indigo-core-prewash-car-cleaning/index.md) ## In short AutoGrooming AutoGrooming Indigo Core is an alkaline car pre-wash tested during a self-service car wash in Korea. At a 1:100 dilution, it cleared bonnet grime first, while trunk grime needed foam and a contact wash. Verdict: convenient measuring and clingy foam, but stubborn grime takes extra steps. ## Good to know - **Product**: AutoGrooming AutoGrooming Indigo Core Alkaline Pre-Wash 800ml - **Use condition**: Used for a self-service car wash on a vehicle with stuck-on grime remaining - **Recommended dilution**: Foam lance 1:10–1:20; pump sprayer 1:100–1:200 - **Tested dilution**: 20 ml product in 2 L water (1:100) for both a pump sprayer and electric foam pump sprayer - **Included components**: Measuring-cup lid and a dedicated cap that fits into the opening *Prices as written by the tester on Aug 14, 2026 · not updated automatically* I received AutoGrooming's AutoGrooming Indigo Core Alkaline Pre-Wash and used it for a self-service car wash. I looked at how it would affect the stuck-on grime that had not come off even with a wash mitt during my last wash. ![AutoGrooming AGD Indigo Core Alkaline Pre-Wash product](https://img.superchart.com/images/agd-indigo-core-prewash-car-cleaning/agd-indigo-core-prewash-car-cleaning-01-15fna-720.webp) ## Was the bottle and measuring setup easy to use? The square cube-shaped bottle and purple color caught my eye first. It was a different design from the tall cylindrical car-care products I usually see. ![Purple square cube-shaped bottle of Indigo Core](https://img.superchart.com/images/agd-indigo-core-prewash-car-cleaning/agd-indigo-core-prewash-car-cleaning-02-1o2sw-900.webp) Its listed features included a formula without caustic soda and vegan fragrance. ![Indigo Core product showing ingredient and fragrance information](https://img.superchart.com/images/agd-indigo-core-prewash-car-cleaning/agd-indigo-core-prewash-car-cleaning-03-14ren-900.webp) It comes in an 800 ml size. The recommended dilution ratios listed in the original post are 1:10–1:20 for a foam lance and 1:100–1:200 for a pump sprayer. ![Indigo Core bottle showing capacity and dilution ratios](https://img.superchart.com/images/agd-indigo-core-prewash-car-cleaning/agd-indigo-core-prewash-car-cleaning-04-pkmac-900.webp) It included a lid that doubles as a measuring cup and a dedicated cap that fits into the opening. I did not need to prepare a separate measuring cup, and it was convenient because I could pour the product into the dilution bottle without spilling. ![Measuring-cup lid and dedicated cap included with Indigo Core](https://img.superchart.com/images/agd-indigo-core-prewash-car-cleaning/agd-indigo-core-prewash-car-cleaning-05-enagu-966.webp) ## What grime was left before the wash? I started my self-service car wash with the product. ![Vehicle before starting a self-service car wash with Indigo Core](https://img.superchart.com/images/agd-indigo-core-prewash-car-cleaning/agd-indigo-core-prewash-car-cleaning-06-1a02h-900.webp) The car had been washed recently, so overall it was not very dirty. Still, there was stuck-on grime left over that had not come off during the last wash. ![Vehicle surface with stuck-on grime remaining after the previous wash](https://img.superchart.com/images/agd-indigo-core-prewash-car-cleaning/agd-indigo-core-prewash-car-cleaning-07-7xpii-966.webp) ![Stuck-on grime remaining on the vehicle before pre-wash](https://img.superchart.com/images/agd-indigo-core-prewash-car-cleaning/agd-indigo-core-prewash-car-cleaning-08-1maav-966.webp) ![Vehicle grime that did not come off even after washing with a mitt](https://img.superchart.com/images/agd-indigo-core-prewash-car-cleaning/agd-indigo-core-prewash-car-cleaning-09-ft0di-966.webp) In particular, the grime stuck to the trunk had not come off well even when I used a wash mitt last time. I first rinsed away the lighter dirt with a high-pressure wash. ![Rinsing light vehicle grime away with high-pressure water](https://img.superchart.com/images/agd-indigo-core-prewash-car-cleaning/agd-indigo-core-prewash-car-cleaning-10-ne6hw-966.webp) ## What happened with a 1:100 dilution in a pump sprayer? Even after spraying plenty of high-pressure water, the stuck-on grime remained. Next, I diluted Indigo Core with water in a pump sprayer. ![Preparing diluted Indigo Core in a pump sprayer](https://img.superchart.com/images/agd-indigo-core-prewash-car-cleaning/agd-indigo-core-prewash-car-cleaning-11-bpac0-900.webp) I added 20 ml of product to 2 L of water for a 1:100 dilution. The dedicated cap and measuring-cup lid made measuring easy. I sprayed it evenly over the whole vehicle and the areas where grime remained, let it dwell for about 5–7 minutes, then rinsed with high-pressure water. ![Vehicle rinsed with high-pressure water after grime has dwelled in the diluted solution](https://img.superchart.com/images/agd-indigo-core-prewash-car-cleaning/agd-indigo-core-prewash-car-cleaning-12-hz1sy-966.webp) At this stage, the grime on the bonnet came off. But the grime on the trunk remained as it was, so it needed additional washing. ## What changed with an electric foam pump sprayer? This time, I applied foam with an electric foam pump sprayer. I added 20 ml of product to 2 L of water, using the same 1:100 dilution as in the previous step. ![Foam car wash using an electric foam pump sprayer](https://img.superchart.com/images/agd-indigo-core-prewash-car-cleaning/agd-indigo-core-prewash-car-cleaning-13-mluf3-900.webp) The foam came out evenly and densely, and it clung well to the paintwork and glass. I liked that it stayed on the paintwork instead of running off quickly. The electric foam pump sprayer was more convenient to spray than a regular pump sprayer. ![Car-wash foam clinging to and remaining on the vehicle paintwork](https://img.superchart.com/images/agd-indigo-core-prewash-car-cleaning/agd-indigo-core-prewash-car-cleaning-14-1dygh-900.webp) ![Vehicle surface evenly coated with Indigo Core foam](https://img.superchart.com/images/agd-indigo-core-prewash-car-cleaning/agd-indigo-core-prewash-car-cleaning-15-a47ms-900.webp) I sprayed plenty of foam on the areas that had been hard to clean. ![Car-wash foam generously applied to an area of stuck-on grime](https://img.superchart.com/images/agd-indigo-core-prewash-car-cleaning/agd-indigo-core-prewash-car-cleaning-16-ww3yh-900.webp) After letting it dwell for a while and rinsing with high-pressure water, the remaining grime gradually started to come off. ![Vehicle surface with reduced grime after foam dwell time and rinsing](https://img.superchart.com/images/agd-indigo-core-prewash-car-cleaning/agd-indigo-core-prewash-car-cleaning-17-ee9ur-900.webp) ## When was the stuck-on trunk grime completely removed? I then moved on to the main wash. This time, I mixed 20 ml of Indigo Core into a pH-neutral car shampoo and used it while washing with a mitt. ![Mixing pH-neutral car shampoo and Indigo Core for the main wash](https://img.superchart.com/images/agd-indigo-core-prewash-car-cleaning/agd-indigo-core-prewash-car-cleaning-18-1eil6-900.webp) ![Main wash process using car shampoo and a wash mitt](https://img.superchart.com/images/agd-indigo-core-prewash-car-cleaning/agd-indigo-core-prewash-car-cleaning-19-flzyf-900.webp) Once I had finished the mitt wash and rinse, the remaining grime was gone. ![Vehicle surface after completing the main wash with a mitt and rinsing](https://img.superchart.com/images/agd-indigo-core-prewash-car-cleaning/agd-indigo-core-prewash-car-cleaning-20-1dgv0-900.webp) ![Vehicle after removing the stuck-on grime](https://img.superchart.com/images/agd-indigo-core-prewash-car-cleaning/agd-indigo-core-prewash-car-cleaning-21-exof9-900.webp) I was satisfied that even the trunk grime that had refused to come off last time was gone. Finally, I dried the water off, added some shine, and finished the wash. ![Vehicle after drying and shine work are complete](https://img.superchart.com/images/agd-indigo-core-prewash-car-cleaning/agd-indigo-core-prewash-car-cleaning-22-13a46-900.webp) Seeing the clean car made the wash feel worthwhile. The easy measuring setup and the foam's ability to cling were good, but the stuck-on trunk grime did not come off with the first diluted application alone. This result came after an additional foam application and a main wash with a mitt. ![Vehicle after completing a self-service car wash with Indigo Core](https://img.superchart.com/images/agd-indigo-core-prewash-car-cleaning/agd-indigo-core-prewash-car-cleaning-23-15yek-900.webp) ![Vehicle after finishing the stuck-on grime wash and final detailing](https://img.superchart.com/images/agd-indigo-core-prewash-car-cleaning/agd-indigo-core-prewash-car-cleaning-24-4y969-900.webp) ## Products - AutoGrooming AGD Indigo Core Alkaline Pre-Wash 800ml — AutoGrooming --- Superchart · https://superchart.com/en/@pair-of-slippers/agd-indigo-core-prewash-car-cleaning/ · https://superchart.com/llms.txt