All my fermenter buckets have a spigot, making getting a sample quite easy. After I take a sample, I rinse the spigot inside and out with water, and then water with iodophor in it. I have never had any issues doing it this way. I have had trouble keeping a syphon running, so I always use the spigots for racking to a bottling bucket, and then into bottles. Now that my process has gotten better, I "cold crash" in the BK, and then pour into my primary fermenter through a paint strainer bag. 80% + of the hot break is caught in the filter bag, and what little gets through, doesn't really affect the amount of trub in the primary. I will say w/o straining from the BK, the amount of trub in the primary is huge.