To speed up the process on my production mobile car wash business I`m thinking of using only Optimum Power Clean (diluted 10:1) to clean the interiors, including dash. Do you think it's a good idea and can work well?
Not sure how using Optimum 10:1 would "speed up the process", but it does clean interiors very well
If you are going to use it, or any other alkaline APC on carpet and upholstery, it needs an additional step to neutralize it. So if you are in a hurry, I suggest Folex for carpet and upholstery
I'd suggest Chemical Guys NonSense APC for the general cleaning,
Very concentrated at 1:20, but you may try different dilution like 1:15 / 1:10 if your cleaning needs are very heavy (always test inconspicuous place first when using lower dilution). Chemical Guys Nonsense All Surface Super Cleaner 16 oz.
The protectant I'll suggest at your protectant thread.