4. There is only one (legit) cure. Yep. You guessed it. The only legit cure for blue balls is to unclog the pipe. Ejaculation (by any method of his choice) almost always cures the pain. There is one other proposed cure men who consider themselves “chaste.” He can try to pop his nuts internally with a Valsalva maneuver, which is described as “forcefully attempting exhalation against a closed airway.” The same way one would try to pop their ears on an airplane. I don’t have balls, but this sounds extremely dangerous.
Yes anything acidic really...but it isn't really necessary as it wont be too bad in small quantities. Think of the amount of cement and concrete builders wash off and so you can guess that this tiny amount will really make little difference. Also is not hugely harmful to you but obviously don't be stupid and ruin your soils chemical make-up by chucking it in the flower beds. i would just wait until you are sure all the cement is set then pour it into the sewer drain (not down the toilet though). It would be easier just to put it in a patch of ground that you don't see like behind a shed or something.