I was gifted a used protein skimmer and was trying to get it cleaned up. If you see the attached photo there's some brown crud on it, I've rinsed it out but it's not coming off, I can't really get my hand down there to wipe it.
Should I soak it in something, am I being over cautious and shouldn't even worry about it?
Thanks
Should I soak it in something, am I being over cautious and shouldn't even worry about it?
Thanks