Cash is cash. As long as you can prove to a seller that you have it, it shouldn't be a problem.
On the other side, landlords often run a credit report before renting to a new tenant. If your "less-than-stellar-credit" is really bad, you might have a problem finding a suitable rental.
Good luck
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Broker-Owner Thirteen Years REO Experience
GRI,CRS,CRB,e-Pro
Some days I feel like the bug, other days I feel like the windshield