tank rust
I've used CLR on a few tanks with surface rust and it worked great. I fill it 1/3 , shake it a bit, then let it sit. Every so often, ( depending on severity of rust) turn tank to a new position. I did mine for 1 week like this, looks brand new. You could put small nuts and bolts, or aquarium gravel in to help scrubbing action.
Just remember the baffle in the tank. If anything solid gets behind it ,it may not come out. I used CLR only for this reason. If you have calcium , lime , or rust in your water, dump it down the sink or "terlet", your choice. Then rinse as above, should be good to go. Have fun.
Chris
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1968 104 , service replacement '96 K301, 42" deck
1997 Scotts 42502X8 , repowered with '96 B&S 18hp TwinII , 42" deck
2007 LA130,21hp Intek v-twin, 48" deck
 As you slide down the banister of Life, may the splinters point in the right direction . 
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