Simply, lay the pillow across your arm to see if it bends.
If it bends over like a saddle bag then it needs to be replaced.
Lynsey added: “Don’t forget your local dog shelter will really appreciate your old pillows.”
The post received lots of positive comments from cleaning enthusiasts who said they will be trying the tests at home on their own pillows.
Instagram user neerusharma_ said: “Brilliant tips! Will be trying this.”