Hi,
Are we talking cars or house?
For house I use Pro Kleen in a Bissell carpet cleaner:
https://www.prokleen.co.uk/carpet-cl...rce=navsubmenu
For the car try diluted Britemax Grimeout - effective and smells quite decent (and is good on really mucky paintwork):
https://www.britemax-direct.co.uk/br...oz-c2x18170497
Drop me a PM and maybe we can get together in the New Year.
Andy.