I think so. For play sand, I use a bucket, add the sand and then stick it under the faucet in my tub. I sit on the side of the tub and swish it with my hand. Then after, I let it settle for about 5-10 seconds and then pour out the cloudy water, repeat. Rinse repeat.
I live in a house on a septic tank and there is very little sand that goes down the drain and I'm not worried about it clogging anything up. I did this today actually. I have cleaned it outside, but its too cold right now!
I can't comment on the dirt because I haven't done that in the tub......yet!
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