I would try sugar soap,it is the only product l use on walls.

This is always fun!! We buy those kitchen wipes, they seem to do a good job (or even baby wipes for that fact). Or a spray and wipe with chux or paper towels.

If it’s caked on grease around the cooktop, degreaser is best. If it’s just random oil splashes on the wall, try hot water with dish detergent in it

There are some really good Greece removers available on the shelves at Coles atm

Warm water with dish washing detergent and a gentle scrubber (the kind you use for nonstick pans). If really sticky then sugar soap works well too.

Gumption is abrasive so it depends on the type of paint.
I got some off mine with a strong mix of hot water and dishwashing liquid, then wiped it down with clean water.
There is 2 types of the soap mentioned as far as I know – powder and liquid.

Sugar soap or gumption can buy both in cleaning isle works well