How to pre clean a very dirty LP before Ultrasound Machine?

@slaw, I feel your pain. Only "kind of" sorry? ;-)

$ 9 water is final rinse on vacuum machine, not ultra sonic, I found steam clean works well for mold. I have a shop vac with pvc pipe I cut slit with drimel put mofi cleaning pad on it (DIY wand) put album on old broken turntable with cork mat and then steam and vacuum for nasty dirty mold albums. I did 90 nasty albums few months ago, I found this method goes pretty fast. I don't want to put these albums on my machine or its wand. Just a warning your house will smell like mold may want to go outside.

@paulcreed 

Reagent Lab water about $9 bucks a gallon at Carolina Biological where I bought it. 

Don’t support Carolina Biological Supply. They are one of the most despicable businesses on the face of the planet. They are well known for abusing animals, injecting them while still alive with formaldehyde embalming chemicals. 

Right on re mold @paulcreed probably makes sense to wear a mask too, you don't want to breath that stuff. 

Will do sleepwalker, looked it up your correct. For me if album has mold spots I through them away. If just dirty and mold smell, steam, machine then ultrasonic.