Welcome to HealthcareMagic forum
drops is to treat infection in the middle ear. Please avoid self cleaning, it will damage the supple skin inside the canal. If the drops has been advised for wax removal, please do not use it. Ear crackling and popping could be due to either opening and closing of the Eustachian tube (the tube connecting nose and the ear) or air passing through the accumulated wax in the external ear.
A thorough ear examination is beneficial in diagnosing the actual problem.
I wish you good health