Against the Los Angeles Chargers in the wild-card round, sloppy was good enough.But the Houston Texans know a cleaner effort will be needed against the Kansas City Chiefs.The Texans overcame three turnovers and eight penalties in defeating Los Angeles on Saturday. Despite those issues, Houston outgained the Chargers 429-261 and pulled away in the second half.Following up the 32-12 victory with a sharper focus and better execution would seem to give Houston a great chance against anyone. But the Texans and coach DeMeco Ryans also know what kind of behemoth is waiting for them in the divisional round this weekend in Kansas City.The Chiefs have won the past two Super Bowls and three of the past five, and the team’s earliest exits from the playoffs over the past six seasons have been in the AFC Championship — and in overtime, no less.”We understand what’s in front of us,” Ryans said. “KC has done a great job for the past few years of really dominating the league, being there at the end. …”It’s a tough, tough team to beat. It’s going to take everything that we have. It’s going to take all four quarters.”The Chiefs, who went 15-2 in the regular season in earning the AFC’s top seed, defeated Houston 27-19 in Week 16.