Somebody will have to help with the lyme away. There are aquarium products designed to help with extra calcium on the sides - and I wonder if they may be quite similar to lyme away. But let's check first. :)
In some parts of the world there are people who use soap to catch and kill food fish. It coats their gills and quite effectively suffocates them.
Many household chemicals, soap included, are designed to kill germs, bacteria and what-have-you. In quantity (over-dosing) antibiotics (which mean anti-life) can kill fish. That household bug spray can kill fish quicker than the bugs! If you don't know if it can be used with the aquarium, experimenting can be very expensive. That is also the sort of thing, which has caused some animal right advocates to call for a complete ban of home aquariums too. So for your sake, your fish's sake and that of the hobby, please don't indiscriminately use household cleaning items on the fish gear.
There are some (vinegar, baking soda, beach - outside in a well ventilated area and completely dechlorinated afterwards) which can be used. But if you have a question, first check around. :)
If you really want to clean a tank (and sometimes those deposits are worth the effort of cleaning off or simply can't be removed - because they are holes etched in the glass)- ask here, look in a n aquarium book or if you are in a hurry Google Guppylog for (cleaning fish tanks) and get over 160 suggestions. You could Google the Net and get 1,670,000 hits.
Google lyme-away and cleaning aquariums. Those filter corners are difficult to get stuff like soap out of. Maybe also Google cleaning soap off of aquarium filters. ;)