I own a black Mk6 GTI and as I live in London, the car is a magnet to dirt. Plus the filthy motorways around the outskirts of London aren't helping either and I've started to notice some bad stonechips

I live in an apartment block so don't have access to a hose, and spending £20 every other week for someone else to do the job is going to ruin me. In an effort to keep the car regularly clean, I need some expert advice on Waterless Wash and Wax products.
I've been reading on DW about all the rave and it seems to be the way forward for me. Anybody recommend any particular one? The one with most information seems to be Optimum No Rinse and they have a wash and wax version which looks interesting.
How do you use these products without being worried about scratches and swirls? Does this method seem safe?
1. Have two buckets, one with ONR diluted and one with clean water..
2. Soak MF towel, remove excess liquid and fold four way.
3. Gently apply damp MF towel to a panel and buff/dry with dry MF towel.
4. Place the damp MF towel in clean water to rinse off dirt, then back into ONR solution bucket and repeat process for all panels.
Also, does a grit guard really help?
Thanks!!!