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I am aware about the thing with the ears earesponsible, my wife explained that to me already, but thanks fort the explanationA few comments. None of the suggestions are "bad", but some are a little hokey. Cleaning your ear canals will in no way affect your eustachian tube patency. Your ear drum is a barrier, you can think of your external canal and your middle ear as completely separate spaces for the most part (though a complete wax impaction could make it difficult to equalize as the ear drum does need to move a bit as the middle ear clears it's pressure).
Nasal saline rinses are fine and seem to help some significantly. I don't think I would recommend the saline rinse as you dive technique though.
Mucus in your sinuses is not going to actually affect your ability to clear your ears, so tapping on your forehead is not going to help. It is however part of the same disease process, ie allergies. For most people, aggressive allergy control (antihistamine, nasal steroid spray, mucolytics like mucinex, sometimes decongestants like sudafed, allergy immunotherapy, etc) are going to do more for improving your eustachian tube function than anything else. Beyond that, I agree with the clear often and clear early suggestions.
OK, good luck. Open your windows and your allergies will be cured. And watch out for those evil chemicals!