The $2.75 Woolworths buy behind a mum's impressive tile grout transformation

A woman has shared the incredible results of using a bargain Woolworths product to clean the grout between her bathroom and kitchen floor tiles.

The mum posted before and after images of the transformation on the Facebook group Mums Who Clean.

Her photos show the grout went from grey to white by using the $2.75 Strike Pro Bath and Shower Cleaner on her tiles.

"Cleaning mania kicked in after having family here for two weeks this is the result I got, one happy Mum here," she said.

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She explained she used the product mixed with water she heated up in the kettle to mop the floor with. The mum also scrubbed the grout with a long-handled grout brush from Bunnings for $31.20.

"Poured 1/2 bottle spray into 1/3 bucket hot kettle water, way easier than spraying the grout beforehand and when mopping, get the mop right in there over the grout, the longer it is left to dry you'll get the results," she said.

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Members of the Facebook group were blown away by the results of the spray on the tile grout.

"Wow awesome," one commented.

"Such a fan of strike," said a member.

"I use this at my clients homes all the time. It's fantastic and cheap," said another.

"Wow, brilliant!" one said.

The Facebook group was also excited by the grout brush the woman used to clean the grout with, and indicated they're rushing out to buy one for themselves.

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Strike Pro Bath and Shower Cleaner is, as the name suggests, designed to clean your bath and shower. The woman who used it to clean her grout also detailed how she uses it for the shower.

"Spray all over shower and leave it for about 5 mins for the smell to lighten up, then just wipe over with a damp cloth and that's all you have to do, no rinsing required," she said.