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

I use a Hunt brush before playing a record ..removes dust, but not peanut butter.   ....for that I use my Nitty Gritty, but it is usually not used much.

Once.
But I have a backlog of unwashed LPs, and if I want to hear one of those, I will play it regardless, if I can see no visual evidence of deposits on the surface.  

I wash new and used records  on a VPI 16.5 one time and one time only.  I give a record a quick sweep with a Hunt brush before play and clean the stylus with a brush, sometime ME and onzo zero dust after each side.

I seriously dislike cleaning records!  But it is my only form of playback so I have no choice.  My first Basis table ruined digital for me.  

I clean records thoroughly once then just use carbon fiver brush to remove dust after that normally.

I clean records manually which is a chore. If I had a nice automatic ultrasonic cleaner I would probably use it more often. Those things are a significant investment.

Map- check out Rushton's thread on DIY US if you haven't-the price of entry isn't crazy, and you can arguably get better results, but it isn't about convenience. And in my estimation, you still need some sort of vacuum machine, to take advantage of different kinds of cleaning, which work synergistically.