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carolandjack said:

Do not keep your black and grey tanks open constantly.  By constantly leaving your black tank open, you will clog up your black tank.  By keeping your grey tank also closed, when you dump your tanks, you have the grey water to clean your discharge hoses.  If you notice odors from your grey tank, there are additives that you can purchase to add to your grey tank to combat that.

One of the biggest mistakes that a person can make is to leave the black tank open.

Jack

Ya, I never keep black tank open.  Greay I will for the majority of the trip except for the last day for the purpose you describe, to fill up and then rinse hose.