The best replacement for clr is lime away.

The best alternatives to clr are rated as following:
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★★★★  win32
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★  dlr
★  mfc
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★  bar keepers friend
★  evapo rust
  cog
  iron out
  alr
  t-sql
  drano
  .net framework
  naval jelly
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  muriatic acid
  tsql
  lime out
  transact sql

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Speaking about clr, one probably shouldn't forget about c#.

Other search terms related to clr and their ratings are:
★★★★★ c#
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clr
lime away
vinegar