I use dish cloths which I put over a tin with a hole in and solar heat.. Can reuse a few times , removing crud when cold. Dump them after a while. Good results
Weigh it down in a pan of water, with the mucky side of the cloth uppermost. Heat the water until the wax starts to melt and rise to the top, it'll take the other debris with it. Take it off the heat. Let it cool. Collect the wax and muck. Repeat, using clean water each time, until the cloth is clean.
= this will probably sound a bit Benny Hill but does wrapping in fluffy disposable cloth work better than stuffing into the leg of a pair of Sainsbury 'basics range' tights - which is what I currently use?
This has got to be the best year ever for solar wax extractors!