You can take the stuffing out, try to rinse it and pat it dry, rinse the cart and shake it out and dry it. Then when everything is totally dry you can TRY to get the stuffing back in right.
On go to strictlyejuice.com and buy the precut blue foam stuffing for 510 very cheaply there. That blue foam is the preferred stuffing, easy to remove, rinse, pat dry, replace. On a full fill, pull the blue foam out, fill cart 1/2 way, insert tapered end of blue foam, press the foam down into the liquid, reposition foam at top edge, top off with a few drop until it looks just damp on top.
And when you get sick of carts, try Boge standard resistance 510 cartomizers (you cannot use the hotter LR ones on slim batteries - you could damage the batteries). Hopefully you bought manual batteries (totally sealed metal on the threaded end so you can safely use a drip tip on the atty and not worry about any small carto leaks damaging your battery)