I struggle with this a bit. I wax my playfields (with Blitz). Perhaps it's my eyesight, and perhaps it's because these are home use machines that I'll hit up every few months, but it's really hard for me to see what is waxed and what needs cleaning. I feel like it's all pretty clean save some rubber dust.

What would be a simple test to determine there is enough wax on the surface, or if the wax should be replaced entirely?

That's just it; They always feel waxed. I guess that means I'm not playing enough.

I suppose you could punch holes in a microfiber cloth and then rubber-band it to the attachment.

I bought one jar in 2015. I think it was the last one after they had a fire that destroyed some inventory. I don't know, but it taught me to be more efficient with it, which is probably good for my playfields anyway.

I will admit though opening the jar has been a struggle. Now I will hold my head down in shame after learning the trick.