なきゃ vs なんねえ

In an episode on crayon shinchan, Hiroshi said to shinchan regarding window washing:

“また 下を洗わなきゃなんねえだろ”

What does this mean? From what I gathered:

なきゃmeans have to
なんねえ also means have to

So is there a repeat of “have to” here?

2 comments
  1. なきゃならない > なきゃなんない > なきゃなんねえ same meaning as なければならない

  2. You should looke up なければならない

    なければ–>なきゃ

    ならない –>なんねえ

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