These types of tools do amazing things and they're increasingly available in a 'single-button' format — which is great for lots of applications. But, we'd advise leaving any noise-reduction, room-reduction, resonance-reduction, etc. type of processing to those who work with audio on a consistent basis. If that's you, then be our guest!
If you're tempted to "clean up" your tracks before uploading them (but your software/speakers aren't necessarily equipped to reveal the results of what you're doing) then your sounds will actually be better-protected if you leave them alone - 'warts' and all - so that someone else can potentially clean your tracks later.
If you have any questions about audio uploading to the site, please reach out to us at firstname.lastname@example.org and we will get back to you as soon as possible.