I literally just tried the ironing tip seconds ago - and it really works!
Red candle wax on neutrally painted wall... Brutal!

Gently scrape as much as you can off of the wall and then hold a white rag (that you don't care about) over the wax and then iron over the cloth with a medium low warm clothing iron. The heat from the iron will melt the wax and the cloth will soak the heated wax up.
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