Washing machine should be fine for the sack. If the rigid back is removable then remove it first. If you can't remove the rigid bit then it's probably best to turn the spin on the machine off if you can.
I too have washed a rucksack in the washing machine, on a 40 degree regular cycle, without problems. It's just nylon. Might be worth checking that any frame is plastic rather than cardboard first, though.
I'd second that -burn it all....or sell it on ebay to some poor sod. Just thinking about how hard it would be to properly clean between all the wire strands on your nuts.
Also can help thinking about how often, while climbing, either rope or gear are held in your mouth when placing gear or clipping.
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