Got my Valterra Flush King 45 Degree Reverse Flush Valve Attachment today. What a mouthful. Didn't have a hose other than our drinking hose and didn't want to use that. So just emptied black tank and back flushed grey tank into it about 4 times and got a lot of extra brown sludge every time until I run out of grey water. Will get a hose and next time, will power blast the black tank a couple of times. So far pretty happy with the results. Thanks for all the information in this string.
Gettin me some Calgon bath beads also.