I've already tried rods, thinner flexible cleaners, caustic soda, acid. The problem is that the blockage is in a really awkward place, so access from outside is near impossible, or I have a collapsed pipe.
describe the awkward place. also, any external interceptor/inspection pits with covers, or external soil pipes? as ever, a picture could be useful
@Polygon started
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I've already tried rods, thinner flexible cleaners, caustic soda, acid. The problem is that the blockage is in a really awkward place, so access from outside is near impossible, or I have a collapsed pipe.