Harry glanced at Ron, seeing his minute nod, and made a decision. "We can open it up, but only after Ron and I go over there to tidy up." Hermione had been living almost entirely at Ron's lately, which meant Grimmauld could be in any state, including knickers hanging from shower rails if Hermione had been too busy to clean up those sort of things.
"As for the Ministry, if the monitoring and warning charms were the first to fail, Hermione might have been on to something. Sirius, do you think you could sniff around as Padfoot if we got you inside?"