If you're going to go down the waterless wash and wax route for a forseeable amount of time, you may as well get a solution that comes concentrated. You can then use the water you do have use of to create a diluted solution, that will go much further. Using off the shelf waterless wash and wax on a whole car, you'll go through a bottle in no time. ONR (Original No Rinse) is a fantastic product that I use for very lightly soiled door sills, and is also a fantastic clay lube. It doesn't leave any residue or wax finishes, but you could even go as far as mixing the solution with distilled water so that no water spots are left if the product dries prematurely in the sun. The product contains carriers that trap and isolate dirt to reduce any marring or scatching.
Here are the dilution ratios I found online that worked for me:
Optimum No Rinse Dilution Ratios (water: product)
- Rinseless washing- 256:1
- Water softener – 256:1
- Glass cleaner – 256:1
- Clay bar lubricant – 64:1
- Quick detailer – 16:1
- Drying aid – 16:1
- Interior cleaner – 256:1
- Before pre-rinsing – 256:1
- Engine bay cleaning – 16:1
I would like to add that this isn't a solution for medium to heavy soiled cars - light-soiling at the most. It doesn't have the same cleaning power as a ready-to-go off-the-shelf waterless wash & wax, but you could employ a small amount of Koch Chemie Green Star into your diluted ONR mix to get that cleaning power. Koch Chemie Green Star is a concentrated universal cleaner, which dilutes very far, and is an absolute must for me on my day to day jobs.