If you have a power washer then spray it down to get all the nasties off. then soak it in a salt solution, if your really worried about parasites or fungus then soak it in a water bleach solution. it doesn't take very much bleach, make sure you rinse it very we'll before adding it to your tank. i would soak it in a bleach solution then drain the water completly. refill it with fresh water then drain it and refill it around 4-5 times giveing it a day or so with each soak. after that rinse it off we'll with either your shower head or a garden hose either will work and then it should be ready make sure you can't smell any bleach on it
