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General Household drain cleaning

We have a small 50s house so plumbing is old. A plumber has suggested getting specialised drain cleaning as our pipes are full of fat and other nasty stuff. No pipes are actually fully blocked but slow draining etc. so could benefit from a decent clean. We also have a septic tank that we can't find anywhere! (we bought house only recently & previous owner didn't know...) Various plumbers have search for it but no sign. Have been advised will need a camera to go through the pipes to find where out where the elusive septic tank is so it can be emptied (We additionally have a grease trap which is located). Would like a quote please on drain/pipe cleaning and for services to find the septic tank. Many thanks