22 years brewing (with 4 years off in the middle) and never had an infection. Only occasionally used a carboy or demi-john for long term aging.
The valve is your weak point. Keep it clean. Star san the crap out of it before draining the bucket. Put a condom on it if you have a spider or insect issues.
Cleaning is easy. Hot water soak. Wipe it down with cloth diaper, used t-shirt or those dustless painters rags (white). Never store anything in your fermentors but maybe that cotton rag. Everyone will say Oxyclean or PDW or whatever but it really is not required...just hot water and patience and soft cotton rag.