I got the french pipe and R4 flavours with mine, and hated the taste of both. So I washed out the carts and foam and have been filling mine with my own juice. Took a good 15 puffs before the old juice flavour faded, but now it tastes great.
Litterally, just pull the foam out, wash out the cart, wash out the foam and squeeze it dry in a paper towel, then drop about 20 drops of juice into the cart, put the foam back in, and drop about 25 more on the foam.
(this is with my 601)
Litterally, just pull the foam out, wash out the cart, wash out the foam and squeeze it dry in a paper towel, then drop about 20 drops of juice into the cart, put the foam back in, and drop about 25 more on the foam.
(this is with my 601)