You can take off the really grotty leaves from the bottom if you like, but it's not essential for the plant's health. Be careful not to damage the growing points.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
Mine look just as bad. I tidy off the worst bits ( that is the brown dead looking leaves) with secateurs. I find the new growth seems to hide the rest.
I just tidy it up or leave it. Many thanks.
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I find the new growth seems to hide the rest.