I carry a new tube with me. I save the bad tubes and patch them later.
Once you screw up a patch forget that tube. It is too much of a pain to get it clean enough to work.

Be sure to scratch the tube enough. DO NOT TOUCH the patch area. That will ruin the patch because oil from your hand will get in there and mess up the glue.

After you put the glue on, wait until the glue is dull. If you blow on the glue you can see it go dull as you make the solvent in the glue evaporate. This takes about 4 minutes. No more than 10.

DO NOT TOUCH the patching surfaces or applied glue with your fingers.

Lighting the glue on fire is fun, but not needed. If you do this dont let it burn more than a second at a time. Dont want to bulble the glue.

I never cleaned with solvents.