[Shakmeister5000]

What do you guys think? What brand do yous recommend I should try? I’m in the UK, sometimes it’s hard to get products from the US shipped over as the shipping costs and price will cost more than the products itself

[Billfitz]

Any well reviewed car washing product will do. As for wax, don't. Use a well reviewed sealant. My preference is Menzerna Power Lock. IMO putting any wax over sealant, let alone two waxes, makes no sense whatsoever to anyone other than those selling it.

[Skyhigh]

Pretty much any (reputable) "pre-wax" cleaner or "pre-cleaner" would do. Don't make it a scientific project. Depending on what it is that you need removed (old wax/sealant or just a final clear-coat oils-removal as a prep), you can achieve the same with an IPA mixture.

I typically only use pre-cleaner before the very first wax application. Thereafter I don't strip the residuals of the old wax layer (unless a very long time has passed between applications) - simply wash (very) thoroughly, de-grease and clay as and if required and re-apply wax.