Do you clean your records before play, after play, or once (and then never again)?

I don't like using the stylus as a dredge, but even after cleaning, some old records will still sound distorted or churn up stuff or foul the stylus- I will do an intensive re-clean, but at a certain point, if the record isn't playing cleanly, I'll look for another copy. I did manage to revive some old copies by multiple cleanings using different cleaning methods, including ultrasonic, but my practices vary, depending on the condition of the record. Every once in a while I'll get an old record that is pristine, but that's the exception. 

I clean on KL Audio once if they look dusty i clean again.

nrenter,

I feel this is a luxury to those, like me, who have put in the time and effort.

If I see unwanted (crap) on an lp after I've played it, I put in my AD before packing it away!

Why have all of the equipment if you don't use it to it's max?

Cheers!

Not sure where crap comes from on a cleaned LP (dust when playing it?…na…) so I clean 'em once and clean my stylus often as that's pretty quick.