Manure is good for the plants and it really ranks. My rain barrels stink too.
My Dad built a "tea box" years ago when he was gardening. It was a raised compost box, about 8 ft on a side and the sides were about two feet high, one side could be dropped to shovel out the contents. He had it on corner posts so that one corner was about 4 inches lower, the floor was lined with old linoleum. At the low corner was a hole about the size of a mailbox opening, and a piece of roof gutter with a downspout hole. He kept a gallon bucket there, and rainwater (or water from a hose) would filter through the old vegetable matter, anything from lawn grass clippings to vegetable tops and mulched leaves, and eventually run into the bucket. He'd dilute that to 5 more gallons of water and spray or pour it around growing plants. Damndest fertilizer I ever saw, and that stuff stunk like holy heck.After you dump 3-4 five gallon pails of compost into 30 gallons of water to make compost tea It will stink too. But your plants will LOVE it twice a week.