I have noticed that the rain guage is not working its only 6 months old I think 

Thanks

6 months!!!! You did very well then. I doubt I last 6 months before taking down to clean especially if we have had a long dry period. Yep as Wolfie said, spiders and webs for sure.
Here is the order.

Close Cumulus.
Take batteries out of console. This is so no bogus rainfall occurs.

Head outside, clean out rain gauge with toothbrush and water
I always put flyspray around pole underneath. That seems to help.

Go back inside.
Put batteries back in. Wait for console to read in data.
Start up Cumulus.

If do have bogus rainfall then in Cumulus:
Edit - Todays Rainfall  ( change to 0.0 or whatever it should be. )

Good luck