im using tons of this:
INDUSTRIAL CLEANERS - Wurth Industry Cleaner 500ml - Tarcisio Caruana Ltd
buying it in huge quantities so it costs even less, but it performs great on almost every surface that needs to be cleaned. great for removing tar and bugs, good for cleaning and removing wax before polishing, awesome for cleaning the engine, wheels,wheel arches, undercarriage, great for very dirty interiors cause it leaves a good lemon-like smell.
and not too agressive, tried it on acryl, urethane, water based paints for all needs (automotive paint, furniture varnishes, boat paints....).
its like a combination of a huge variety of good products mixed together.
one day ill try if it cures some diseases...
2nd product that amazes me is the 3m synthetic wax:
Protecting a Car's Finish with 3M Performance Finish Synthetic Wax. Video instructions and product recommendations. 3M: US
i use it when a customer has nice b**bs... uhm.... when a customer is an ok person and it needs just a fast wash. if they have 2-3mins more to spare, i use this wax to hide away the fingernail scratches on the door handles. of course they become visible after a few months, but its just a great product to have for such needs.
not to mention how easy its to use and the surprising durability of the product.