I always check the chainring bolts before stripping out the BB. In the summer months I've had good results by simply laying my bike down (drive side up) and applying lube (not WD40) to the chainring bolts. The sun warms up the chainset and you get good penetration of lube and it can save a lot of work. It's not 100% effective though and it didn't work for the dreaded 'Cannondale Creak' on my CAAD12.