a thought, for the concerns of a sudden lack of soap suds on the paint finish when washing, is that the Turtle Wax Zip Wax wash solution that I am using, may be stale.

It wasn't that many years ago I had purchased two bottles (1.18L each) of the solution. In fact, prior to purchasing the two bottles I had been using a large 4L jug of the solution which lasted an incredible amount of years however I had never experienced a lack of soap suds when that 4L bottle was finishing up.

'just a thought.

perhaps, years ago, Turtle Wax Zip wax lasted longer, and that they're not made to retain they're effectiveness as long, today.