Koch Chemie Reactivation Shampoo RS is an acidic shampoo designed to help 'reset' the surface performance of a ceramic coating that's lacking.
Dissolved solids in water can embed itself into a surface, and that's visible with water spotting as well as the coated surface just not beading up like it used to.
The surface should be pretreated with an alkaline pre-cleaner like Multi Star first, fully rinsed off, and then be used at a ratio of 50ml for every 10L of water (50ml for around half of a 5 gallon bucket). MEASURE as a pH level of 3.0 is achieved with this dilution ratio.
Reactivation Shampoo RS may also be foamed onto a relatively clean car using an adjusted dilution ratio in the foam cannon to match the bucket ratio (5ml for a 1L bottle). Ensure the vehicle is fully rinsed after washing.
*ANY TIME YOU ARE WORKING WITH AN ALKALINE SOLUTION ON PAINT, you are managing the time of day, exposure to direct sun, NOT working hot panels or other surfaces. Neglecting to use appropriately can cause etching on paint. Work your situation and time of day so you achieve the expected results. This is a product relied on by professionals- anyone can purchase and use it so long as the proper methods are understood first.