There seems to be allot of threads about guys getting infections lately, what are the main causes of infected gear and what could lead to gear becoming contaminated?
Also are some AAS more likely to become contaminated or grow bacteria over others?
Is heat a factor or is it just the way they're brewed?

Running through hypothetical situations:
You use half a bottle of "your choice here" than store the rest of it in a plastic container for your next cycle in 6 months, could the storage causes it to become contaminated?

Just really interested in finding out why people are getting infections.