In addition to Hydrogen Peroxide, Oxalic Acid might be an option
I haven't tryed it my self. "Boiling the wax" put me off.
@Crayzyhorse might give it a try tho ...:)
Snipped from "Wax Book,pdf":
Might be a place to start:
https://www.basa.uk.com/Home/RecordCard/beeee5b2-813f-a064-1b7e-12b904c309ce
Most likely there is some local dealer offering these products.
:)
RFox