Here's a neat tip to keep in mind when you're out camping or just too broke for the laundromat.
This useful tip from Five Gallon Ideas explains how to build your own DIY washing machine using a five-gallon bucket and a standard bathroom toilet plunger (be sure to clean it first!). You'll also need to make sure you're bucket which comes with a tight fitting lid.

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Firstly, drill a hole in the lid that just big enough for the handle of your plunger to move through. Then drill around a dozen 1/4 holes on the sides and top of the plunger to allow the water and soap to flow through properly. It should look like this:

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Now you're ready to use your DIY washing machine! Just fill the bucket halfway with water, add your soap and dirty clothes, and pump the plunger up and down for several minutes to let the suds work it's magic before rinsing and drying out the clothes. You might need a little more elbow grease to tackle those tough stains, but it's still better than looking (and smelling) like a slob.