It’s very difficult. The highest recommended one I could find was Eska but it’s impossible to find a retailer or wholesaler of it in the US. Eska direct won’t even reply to any kind of a small player. I tried - several times.
I ended up going through a distributor here in Texas (Olmsted Kirk/OK Paper). Apparently, this is made by Manchester Industries. And it’s actually 80pt - not 70. My bad.
The price isn’t bad for getting 1 bundle at a time.
These guys have some interesting products if you are willing to buy by the pallet. Unfortunately nothing looks to be archival. Might be something there for future projects.
The scrape and iron method is what i have always used (candle wax and bees wax are dual occupational hazards i face and some of the altar cloths are ridiculously expensive)
Scrape off as much as you can without damaging fabric
Place paper (butchers, or brown paper bag) over and under under the cloth and iron it as slowly as you can - this should blot most of it up
Wash in as warm a wash load as you can with detergent.
I concur. We do keep a supply of liquid wax remover on hand. Sometimes you get the wax out, but since it isn’t 100% beeswax most of the time, some type of solvent is needed to clear the stain and return the material to original appearance. Test on the fabric. Often it depends on the fabric of the tablecloth and the nature of the wax. First an iron with paper towels to get the big stuff. Then use paper grocery bags. They are thick and really soak up the wax and spread it out into the paper.