It depends on how bad they are.
For clearing my sinuses I'll use simply saline spray. I try to stay away from any other sprays. You'd be surprised at the stuff you find in the ingredients list.
I use Sudafed sinus and sinus pressure. It works for me and I tend to take it before bed so i'll sleep well.
I try to limit what I put into my body, but don't be that person who is suffering and takes nothing. Zyrtec is also great. Just make sure when you use it you read the "Warning if you Have" section. Same applies if you are asthmatic, because Benadryl could kill you.
Humidifiers help at night for easier breathing, they're cheap too. Hot food and steam clears sinuses.
And orgasms - they alleviate congestion and open the nasal passages.
Hope this helps!