If you have an older car with paint in poor condition I would go with OCW. It will help with UV protection and help to seal the paint. It is a hybrid product. Very pleased with its performance on my dad's 16 year old beater with poor paint.
Might take some effort on the first application but will be much easier after.
If worried about dirt get a $6 pump sprayer and presoak a panel before hitting it with the BRS. This increases lubricity greatly.
Could use ONRWW at the standard dilution as a drying aid if needed, but ONR is it's own drying aid.
The product I have phase separates very quickly. Is this normal? Also seems to be hard on sprayers if not used for a while.
This product cleans plastic very well. Would the protective properties stick to hard surfaces?