Sponges.

sponges are the hardest to clean aren't they___

you lather them in soap and try to scrub away crud from dirty dishes,

and maybe you'll wring out the sponge so it doesn't get moldy

but you'll never get the water completely out.

overtime the mold will build up

and the dampness of the porcelain sink will only warrent

more growth of unwanted organisms

that make home in the pores of your plastic polymers.

and you're so busy scrubbing away at pots and pans

that when you finally realize your sponge has been eaten away

by the parasites your habits created,

you'll be left with only a limp shelter for contamination.