Stopping cat from clawing furniture

Thanks all for the advise....this particular cat is over 7 and I just won't consider ever having any of mine declawed (won't get into that subject)...I have the long scratching boxes, but never thought about her preferring the vertical one...I will certainly try that. I have covered the corners of the furniture already. I may try the doubled sided tape and squirt bottle of water.
None of our 3 cats would allow the nail clipping (one is feral) the other 2 are very mild and tame, but do not like their feet touched.