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Bar looking unsightly are solder snots ruining down the pipe from the above fitting a problem. Guy I work with does this. Looks bad but is on a first fix so underfloor pipework that will never be seen.
I wouldn't worry about underfloor pipework, as long as it's leak free it's all good. With visible pipework I always clean the pipe with my flux brush to brush off any excess solder while it's still hot enough and then when it's cooler clean off the excess flux with a rag