Legend said:
If it is not too bad sometime a good dose of sunshine will take care of it - I use a solution water and bleach - about 1 part bleach to 10 parts water. I just spray it on the mildew and walk away - an hour or so later it should be gone - I have not had any color issues with the bleach at this diluted strength. I tried a bunch of products that are sold in marine stores and none of them work. good luck
I would test a small spot with the bleach mixture first to make sure it doesn't damage the color.
I also have a 208 and searched high and low for the recommended cleaning process and unfortunately, that depends on the type of material. I searched for labels but couldn't find any. Looking at various fabric cleansers, each had warnings about using on specific fabrics so in the end, I uses a soft brush and mild soap followed by a light rinse with a wet towel. I repeated that several times and let the cushions dry.
If the mildew is in the foam, it will come back. You can spray the foam with a mildewcide but you need to test a sample first and you need to remove the covers, That is a royal pain.
After the whole thing is dry and clean, an application of Scotch Guard will help going forward. You also need to test an inconspicuous spot first. I suspect that the fabric could be dry cleaned too.