Newbie - problem cleaning up image on transparent background

I have a purple graphics file of a logo - created with a transparent background.
The problem is that there is an unsightly splash of white specks across some of the logo extending out into the transparent area.
I'm new to Photoshop and have been trying various things to no avail.
1) Because I found the checkerboard background to offputting I eventually figured out how to create a colour filled layer and set this as a background to make it easier on the eyes to try and edit - not sure if this was a sledge hammer to crack a walnut!
2) I've selected both layers - the graphics plus the yellow solid background layer
3) I've watched some tuturial videos that mention the "Spot Healing" tool ... I've tried this but it doesnt seem to do anything, certainly doesnt remove the white specks
4) I've also found some references to the "Clone Source Panel" - I eventually found this to select essentially nothing (ie transparency) to replace the white patches - but again nothing happens.
5) To check I wasnt going completely mad I selected the "eraser" tool and this works in as much as it removes yellow from the yellow background layer
Please can someone advise where Im going wrong thanks.
Hope it makes sense.
Regards!

The eraser is removing the yellow because the background layer was also selected. Make sure only the layer to want to edit is selected and nothing else.
If you get stuck, post a screen grab of photoshop with the layers panel open. Then we can give you better ideas.

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I totally forgot to put that in my post. Yes, I am putting logos with transparent backgrounds in front of colored rectangles. That's how I noticed that this one logo is showing up with a white background. The weird thing is that the other two logos are fine. I did find a different version of this logo and this one works fine. The one that works fine is a JPG and the one that shows up with a white background is a JPG.

Newbie - problem cleaning up image on transparent background

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