barb,
Nice to hear from you again. I use the product Super
Blue for spas. It is formulated for hot water. Have been
using it for about 20 years. It is a product made by
Robarb.
Remove your mineral and bromine products, add
a couple of ounces of Super Blue to the spa, turn the
jets on high, add an ounce of Dichlor and let it rip.
In a matter of a minute, all of the oils will come to a
head in the spa. Scoop them out using a skimmer net. It
will look like a soap factory for a bit.
Then use a foam buster, let the spa filter clean again.
Re-install the mineral and bromine cartridges. This
should work for you...