One thing you can do to dry out and clean crap from (as well as use for cleaning the contacts with a bit on a cotton bud or scrap of bog roll) that works well is dry isopropanol (isopropyl alcohol, propan-2-ol), evaporates cleanly and won't damage the internals, available cheaply online, ebay etc. if something like a USB drive has gone through the wash, a soak in isopropyl will help draw the water off the circuit boards and into the iPA, any left inside, after a while in a warm room, on top of a warm computer (not plugged in until its out of there) to the temperature tolerance of the device will assist in speeding up its exit.
Just had my shipment of dry (0.037% H2O content, if I need it any drier than that ever, I'll distill it over quicklime (calcium oxide, CaO) under pre-dried inert gas, and redistill from the receiver, from a portion of calcium carbide, sparge the redistilled product with pre-dried argon gas or nitrogen at all times protected by dessicant tubes and transferred from or two containers or directly used, transferring with a freshly cleaned, with water, then 2x with dry isopropanol before oven-drying, all-glass syringe and metal cannula needle to transfer the product either directly to where it is used, when it is needed, or if storing excess, via cannula through rubber septum to cap off a freshly oven-baked out, dry argon-purged glass container after degassing under vacuum. (this procedure will work to dry alcohols very, very thoroughly indeed for the most demanding of applications although is overkill in the extreme for electronics cleaning)
The CH3CN (acetonitrile, methyl cyanide), isopropanol and sodium bromide ordered all arrived. A little over 12 hours after buying too, which is fairly impressive. Might prepare a little elemental bromine later and react it with chlorine, with iodine and with both. Not sure if tertiary interhalogens containing Cl, Br and I exist, would be fun to find out though.
