I have a 4 year old Dell laptop which worked great prior to getting a little wet; is it pooched?

I had it outside on a lawn chair, went inside for a minute and an unexpected light rain came on. The laptop was open and the keys and mouthpad got a bit wet. The keys and typing works fine. The mouse doesn’t. The mouse pad, you’re able to move the cursor around, but, clicking on anything won’t work. Warranty done.

Should I get it fixed, or invest in a new one?