Strong cleaning product

[Juststopamoment]

Can anyone recommend a strong leave on cleaner to remove caked on residue in the bathroom? It’s in an awkward place so I’d rather just spray something on and wipe off. Than you.

I use a 50/50 mix of vinegar and washing up liquid. It does need to be left to work for 10 mins or more. When that doesn't work, I turn to Kilrock.

Spray bottle with neat sugar soap?.