MILWAUKEE — The bottom of the sixth and seventh innings were a giant cloud of smoke and the entire night a dumpster fire for the Mets.

Max Scherzer and Brooks Raley prompted the smoke with five home runs allowed — the Brewers celebrate each blast they hit by setting off fireworks, which creates quite a haze with the roof closed — but the Mets co-ace and lefty reliever were only part of the problem Tuesday.

Simply, the Mets lineup was non-competitive for a second straight day and third time in six games to begin the season in a 9-0 loss at American Family Field.

The Mets extended their scoreless streak to 20 innings, getting shut out in a second straight game, as Wade Miley and the Brewers bullpen pitched to soft contact.

The Mets did not record an extra-base hit and got only one runner as far as third base.

“It’s a well-seasoned group, that will be something that will work its way out,” manager Buck Showalter said, referring to the offensive struggles. “I have got a lot of confidence. We’re, what, six games into the season? There’s a lot of guys who have a good track record that will continue to do that.”

Showalter was asked if there are any tweaks he would consider to the lineup.

“I’m really happy to go with what I have got,” he said. “We have good people. Good players.”

This latest ugliness followed a 10-0 loss Monday in which Carlos Carrasco and Tommy Hunter struggled and the Mets managed just three hits.

Now the Mets (3-3) can only hope to avoid a series sweep before heading to New York for Thursday’s home opener. The Mets began last season with 10 straight non-losing series, but got only as far as one this year, with three victories in four games in Miami last weekend.

Rowdy Tellez, Brian Anderson and Garrett Mitchell all went deep in succession in the sixth to leave Scherzer’s night at the bottom of Lake Michigan.

Raley entered in the seventh and surrendered consecutive blasts to Anderson and Mitchell that punctuated the dreadful night. Anderson and Mitchell both homered against Scherzer with two strikes on them.

“Credit them with two strikes,” Scherzer said. “I feel like I am generating swings and misses, so it’s kind of not the stuff, but I am not having the out pitches. I’m not generating swings and misses with two strikes, not generating strikeouts the way I can.”

Scherzer’s final line included five earned runs allowed on eight hits and two walks with two strikeouts over 5 ¹/₃ innings. It followed an Opening Day performance in which Scherzer was solid into the sixth before allowing a two-run homer to the Marlins’ Garrett Cooper.

On this night, Scherzer surrendered five hard-hit balls in the first inning but minimized the damage, allowing just two runs. Anderson’s two-out, two-run double accounted for the Brewers’ scoring in the inning before Scherzer retired Mitchell on a shot to left field.

“I have just got to pitch better,” Scherzer said. “There is no other quote, there is no other way to do it. Be accountable for what you are, and get the outs when you need to get outs, especially when you have got two strikes.”

Christian Yelich and Willy Adames each singled in the inning — with Adames advancing to second on Brandon Nimmo’s throw to third base — before Anderson delivered. That 2-0 lead held until the Brewers’ homer barrage began in the sixth.

The Mets received consecutive singles from Nimmo and Starling Marte in the third that were wiped out when Francisco Lindor hit into an inning-ending double play. In the fifth, Jeff McNeil was hit by a pitch and Eduardo Escobar singled before Miley recorded three straight outs. The Mets went quietly from that point.

The fact the Mets were so unproductive at the plate might have affected Scherzer because he was returning to the mound so quickly. Fatigue has become a factor for pitchers with the pitch clock pushing them.

“I don’t care who the pitcher is, that’s a challenge, when you are having to go right back out there,” Showalter said. “We had some quick innings. … Miley works fast, and that played right into his favor.”