My inserted built-in shower/bath stall drains very slowly. No other drains in the house (mobile home) have problems.

The usual drain cleaning liquids do not work. The shower/bath unit is behind the heating system so it is hard to get to the trap from below.

Is there some way the drain can be removed from above and allow me to get a flexible cable down from above?

Someone said blow it loose with a vacuum cleaner in reverse. Was he joking? There is a breather at the drain opening lever just under the faucet which would relive any pressure applied. But maybe it could be plugged.

Anyone know a way, please.

Remove the strainer cover over the drain. Use a manual or power snake to ream the drain. The " redneck" method is to push a water hose down to the clog & use water pressure to blast the clog. This is NOT recommended.

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Originally Posted by bones252100

. The " redneck" method is to push a water hose down to the clog & use water pressure to blast the clog.

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Also known as a farmers fix, lol.

That's some trick if you expect to get the hose through a complete trap followed by a 90 elbow. I think most homeowner DYIers will be OK with a 1/4" snake with a twist handle. I also recommend a home brew that won't harm you or your pipes. Mix 1/4 cup table salt wi an equal amount of baking soda, pour the mix in the drain followed with a cup of vinegar. Watch the cool reaction, soak over night and then flush with a few buckets of very hot water. Most shower clogs are a mix of rotting hair and body oils and the soda will get them both.