Windscreen Washer problem

Does anyone know why my windscreen washer sprays are quite weak on my ZT+ ?



They work etc but the spray is very low and quite weak even though the bottle is full. I have 75% water and 25% concentrated screenwash.



I don't have a washer bottle lid as it's dropped in my under tray and its only online for 12 pounds!!! wtf. If anyone has a spare washer bottle lid for an mg zt I'd buy one. I am using tape as the lid, but that shouldn't be causing it to be weak should it?



P.S. Is it ok to just add warm water as the engine coolant by taking off the radiator cap?

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