which type of sink for record washing

More important to upgrade the drying rack from the $0.99 Kmart rack to the $1.29 Target one. But seriously, one with nice spacing and rods that allow you to load records on without scratching on the rack, and let any drips fall through without landing on the adjacent LP. The one I found held about 12 LPs, enough to match my patience when washing by hand with disc doctor brushes/fluid.

Sorry off topic, but if $ ever allows, spring for the VPI 16.5, much easier and more effective, IMHO.
Spencer

Metal will result in a ringing resonance that will infect your records...

Above all, make sure the sink has a drain hole of sufficient diameter to accommodate a CD-eating disposal.

And wouldn't a ceramic sink make your records sound like you're using a ceramic cartridge? That's why I had a diamond one put in...

Agree with Elizabeth.

Go for a spray nozzle. If a spray hose is not an option (I don't have one) then a Water-Pik works quite well (takes longer though).

Being clumsy I place a soft plastic tub in the sink (others use towels), so the sink material is not really an issue. As an ex cook I prefer ceramic sinks for their durability.

A double sink would be super (one side for wash and the other for rinse) and/or a large single "deep" one with a center drain.

I use filtered tap water for everything, but this requires a decent filter. Mine's and inexpensive faucet mount unit (PUR PLUS) which produces cleaner water that the distilled I have purchased locally. The distilled water leaves visible residue when evaporated (the PUR water does not). The yield is approx. 100 gallons per filter and replacements are around $18 (retail), so figure less than 20 cents/gallon.

PUR has/had (not certain if they still sell it) a less expensive filter cartridge not denoted "PLUS" and they are not as good as the PLUS version.

You should also look for a Groovmaster kit (Ebay) which is a device that seals off the LP label (both sides @ once) with rubber "O" rings. This is what I use when I wet clean.

If you are still with me the MOST IMPORTANT step in cleaning an LP is to give it a high preasure rinse with clean water before a brush or cleaning pad ever touches it. Otherwise the brushes/pads can move around hard particles scratching the LP (would never use a cleaning machine without performing this first step).

I've cleaned hundreds of used/new LP's (have thousands to go) and with this first step surface noise is rarely an issue if the LP is in good shape to start with (other than being dirty). I blast/rinse new LP's as they can also contain particles which are harder than the Vinyl.

I have not used one for years, but lab sinks (faucet fixtures) would be nice for this purpose. Seems that they all produced high preasure somehow, even when the line preasure was not so good.