My daughters had habit like this.i just did explain them walls are not for drawings.But after giving them unwanted papers to draw they know what to do.i always keep them on the table they can reach out for drawings.

Thick* Paint* We need an “edit comment” thingy haha

For crayon gently scrape off any think chunks then hold paper towel over it & lighty run a warm (not too hot) iron over it. Makes it melt & soak into the paper towels. If your paint is very porous it might soak into the pain a bit but you should be able to use a baby wipe to get the rest off

In Coles or Woolies you can buy “Magic Eraser Blocks” especially for this situation – easy to remove

WD40

Buy butchers paper to cover the walls or give them chalk for the driveway.

Our youngest was and still occasional is shocking for this. We were lucky enough it was mainly grey lead. Start taking the pencils or crayons away and putting them up, only giving them when they want to colour

Gumption will be your best friend and keep all pencils out of reach

Crayon can be tougher but if always try not first and lightly rub it in, magic erasers are good but they are essentially a light sand paper so could effect the paintwork.
It was hard work getting my kids to stop drawing on the walls and even now I’ll still occasionally catch the 3 year old. I make sure now to have plenty of scrapbooks around for them and write their names and things on them to make them excited to draw here instead of on my walls or furniture. Good luck!

Jif or magic eraser. Just check if not taking paint of

Try using WD-40 works really well to remove crayon on painted walls. I sprayed a little of the product onto a cleaning cloth and wipe over the crayon marks it just lifted the wax crayon off. I washed the walls after with Sugar soap all bought from Coles or Woolworths. (P.S. Do not rub hard let the WD-40 work it’s magic).

My 7yr old has Down Syndrome and still scribbled on the walls and my nearly 10yr old has a Reactive Attachment Disorder and draws occasionally on walls & furniture too.
I found a gentle clean with Jif on a sponge scourer works the best. Don’t scrub too hard as then you remove the paint from the walls