I have used and liked Mother California Gold, Ultima, super slick in suds, P21S body work shampoo and most recently Lusso on reccomendation from a pro on this board. I have not had any strip wax or sealant when mixed correctly.
All the above provide lubricity, and soil removal (not grease removal) you said maintenance wash right.
Good luck. FWIW, the process is much more important than the product. All the washes mentioned above, plus a whole lot more will get you there. You don`t need to spend alot of money. I would invest a few dollars you save in the PH strips to prove to your self that it is neutral. You will be able to feel the lubricity and see cleaning ability. PH plus lubricity and cleaning ability along with an easy rinse are all you need.
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