Spot on John re the grease emulsification in heavy spray. That's why the red sticky grease became very popular as the all weather users found it kept seal at the outer edges of the bronze bushings. I have used it but went back to Castrol molybdenum the,grey stuff. as I noticed the red held grit at those edges.
Apart from the in use grease top ups I fully flush the old grease at the end of the season. However the longer the hub/pin fitment stay fitted I have found you do get retained grease in the hub cavity and you do end up with a sort of cannel which the new grease travels through leaving old grease in place. You will know when this happens as grease applied at the nipples will exit immediately and the top nipple will produce little effect. A hub strip down, clean and inspection is the way to go and this is one of the main problems for his hanging up on the pin.
