It may not be the most efficient, but I use Greenway's Car Shampoo. Full disclosure, I use a "splash" of shampoo because I don't have time to measure for every wash bucket. I also increase froth/foam with my pressure washer. It foams great and you can pick any color/fragrance you want when you buy which is cool.
They recommend 256:1 ratio, or 1-2oz per gallon.
https://greenwayscc.com/collections/...ys-car-shampoo
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SOLD! 9/1/2020 2018 ZL1 A10 Hyper Blue - Rotofab CAI, Gibson catback
@SurefireDetail
OEM ZLE tails/third brake light, Gen5DIY reverse LEDs, front Amber LEDs, SMG laser LED side markers, SMG smoked reflectors
1994 Trans Am LM7/CPT 4L60E/9"
1987 IROC
2006 Silverado