And I must disagree with your statement of the products being “exorbitantly” expensive. If you’re looking for the results that most professional grade products provide and the educational material that is available for and about them, then this is what they cost (regardless of where you look). If you’re comparing them to the prices of many of the over the counter products available at your local auto parts store, then yes…they are typically more expensive. But you won’t find true professional detailers using those over the counter products because they can’t get the same level of results out of them. Professional detailers like me, and like the other authors here on the DI Blog use (and write about) what works.