Thank you so much for the feedback. We're always looking for ways to improve our products, so we appreciate you sharing your experience with us.
The lemon-lime Foaming Bathroom Cleaner uses a EPA Safer Choice approved non-staining dye, so it should not cause spotting. This is also true for all of our colored cleaning products. Since the surface of your sink and toilet stained, it might be due to the porcelain surface being compromised (scratched or nicked due to regular use over time) and thus is no longer properly sealed. We are very sorry for any inconvenience this caused, but are glad to hear that a little elbow grease and scrub brush were able to remove the spots.
For now, the best thing to do is wipe away the cleaner before the surface dries, so in that regard you're already doing what we would advise.
We recommend that in the future you do indeed order the sweet lime foaming bathroom cleaner since it packs the same powerful cleaning punch without the addition of dye. We also recommend testing in an inconspicuous or small area first, when using cleaning products in general.
If there is anything else we can do to further assist you, please reach out at firstname.lastname@example.org or fill out the contact form on our website.
The Boulder Clean Team