Hello friends, As the title suggests, I bought a used canister filter (EHEIM, not sure which model but it's old) recently and I managed to piece it together and it's in working condition. However, the previous owner was a bit of a smoker and I've cleaned it as much as I can but I can still smell the tar off of it and the water does turn yellow-ish when I run it (currently have it running in a bucket when I was testing it out). I've bought stuff from this person before and I fixed the issue somewhat by using a vinegar solution (scrubbed an aquaclear HOB filter and the media with it and issue's been gone ever since) and I'm doing the same right now in that I have a very weak vinegar solution running through the filter and scrubbed as much of the stuff as I could and cleaned the first couple of inches of each end of the tubes with this tiny pipe cleaner I have (the inside of the tubes have some sort of black stuff in it and I think that it's either tar or just stains from being used over the years, leaning more towards the stains from over the year bit) but I'm worried that this isn't enough. Any thoughts on what I can do? I plan on using this on my main 95 gallon tank which has 2 HOB filters on it so it'd be great if I can get some help.