What kind of steriliser is it? Sodium percarbonate (also called no rinse sanitiser)? Or VWP? Or Star-San/Chem-San?
VWP you can clean and sanitise. It's bleach based, so you can soak your fermentation bucket in to help get the mank off the bottom. You can then use it 10-15 minutes again before filling up the bucket with your beer. I use a non scratch (you don't want to scratch as that is where microscopic gunk will hide to ruin your beer) scrubbing pad on my buckets and VWP or PBW (which is an oxi cleaner, but not a sanitiser) to clean out my buckets.
That pressure barrel, that might cause you a bit of headache if you're using it to serve up your beer. They tend to leak ,so you'll need to check all the O'rings and taps and make sure they're tight. They're also really only good for beers that don't need a lot of carbonation like a British ale, rather than IPA/lager. So you might want to bottle, depending on what you want to make.