Wiper "scrubbing" is possibly the issue. Take your normal windscreen cleaner and clean the screen thoroughly. Then, clean the wiper blade with the window cleaner. This will leave black residue on the cloth so use a disposable cloth (e.g. Chux). If this does not resolve the problem, get some Autoglym Glass Polish (not cleaner, POLISH) and polish the windscreen thoroughly, paying particular attention to the lower part where the scrubbing is happening. If none of these measures works, then you may have an issue with the wiper blade or mechanism. Tesla wiper blades are a Bosch part (aerotwin) models, readily available on eBay and elsewhere.