When I did my conversion I ran across the same thing. Don't worry, I think a majority of our cars are all the same. I had mine off the car and I took it to my friends garage. He has a parts washer. I bought a refrigerator brush from Lowe's. Long skinny brush with stiff bristles and bendable shaft. I just ran that sucker in and out of there till it all came out. I tried the soaking bit but this was the only way I got it to come out.

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'85 300SD (formerly california emissions)
'08 Chevy Tahoe
'93 Ducati 900 SS
'79 Kawasaki KZ 650
'86 Kawasaki KX 250
'88 Kawasaki KDX200
'71 Hodaka Ace 100
'72 Triumph T100R