I’d suggest a wash mitt instead, because a cheap sponge (or any sponge really) will likely result in swirl marks on your paintwork. 1. citrus pre rinse 2. snow foam 3. jet wash This will reduce the chance of marring the paintwork when you start a mechanic wash with the mitt. 4. first light wash with mitt 5. rinse or second wash with mitt, then rinse 6. dry the car with dedicated microfibre towel. 7. secondary paint process eg. correction or clay barring etc. I also use two mitts and a grit guard in the bucket. If your car is heavy soiled, I’d recommend a second bucket to wash the dirty mitt in. It’s much easier to get a local hand car wash to do it