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beseku
There are loads of video on YouTube about "fixing" those shifters.
All the bikes I had with those shifters had the issue you describe.
As @MCamb says, you need to soak them in / flush them with "something" - personally use "Elbow Grease" degreaser from Poundland and it works well.
Then you can also check if the cable have started fraying in the shifters as that's the next logical step.
Easy / satisfying fix.
And in the long run, you can get newer shifters like Shimano Claris.