I get slightly irate when I hear about people with ear wax problems. In all cases, it turns out the cause is avoiding warm water, specifically submerging the head in warm water.
Even cool water (pools, oceans, rivers, lakes and such) works, if one immerses the head in water with regularity.
No sources are going to be provided for this one. The removal of built up ear wax is done by using warm water. Or in extreme cases, chemicals and physical means.
But from an evidence based scientific view, nobody who regularly bathes in warm water, which means submerging the head in warm water, suffers from ear wax build up.
(Ear wax dissolves in warm water)