Clarke's team were beaten 3-0 in the five-Test series, failing to win a single Test in an Ashes series for the first time since their 3-0 loss in England in 1977.
They have also gone nine Tests without a victory following a 4-0 loss in India earlier this year.
But, despite that miserable sequence, Australia captain Clarke sees signs his much-maligned side are on the up.
It is Australia's performances over the last three Tests, where they were only denied victory by rain in Manchester, enjoyed dominant spells in defeat at Durham and then forced the pace at The Oval, that give Clarke belief that his players are improving quickly.
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"I certainly think we take a lot of positives, especially from the last three Tests," Clarke said.
"We would have won in Manchester if it didn't rain. We got close in Durham after being 150-1 batting last and without rain here on Saturday it would have been a great finish to the final Test.
"I'm really pleased with the boys. There have been some special personal achievements in the series.
"Shane Watson batted well in the first innings here and Chris Rogers and Steve Smith have scored Test hundreds.
"When we get a win we will run with that momentum. We need to look at the whole series and areas where we can improve, but we will take a lot of confidence from the way we played in the last three tests.