I use Skin Grip brand. https://www.amazon.com/dp/B07G9QQJZZ/ref=cm_sw_r_cp_apa_glt_fabc_2E4VQSZ8SVNDC92WW3RD
I have also used and liked Simpatch brand as well. https://www.amazon.com/dp/B07QGX3HJW/ref=cm_sw_r_cp_apa_glt_fabc_68K05JCRZNCHRBXA6JXJ
Sometimes I use them with a shield if I feel like reusing the sensor for longer. It allows you to pull off the overpatch without taking the sensor with it. https://www.amazon.com/dp/B07Z7L1KSM/ref=cm_sw_r_cp_apa_glt_fabc_CZ2A1SK3XB33YYW792V2
I hate the peelz brand. Way too flimsy, ends up sticking to itself and impossible to remove from the shield. The adhesive is also just barely over the size of the original dexcom sticker.
Wearing it on my arm improves the longevity of the adhesive.
In addition, I improve the stickiness to my skin by using adhesive promoter Skin Prep https://www.amazon.com/dp/B000S9KLSY/ref=cm_sw_r_cp_apa_glt_fabc_P66HR47GMKWRG45RBR10?_encoding=UTF8&psc=1
And when its time to take it off, and the adhesive stays stuck to your skin, I use Uni-Solve to remove it. https://www.amazon.com/dp/B00M3IKRFU/ref=cm_sw_r_cp_apa_glt_fabc_HX2GJ35SHKRPCAJCSRB3
LOL I would call Dexcom and just ask for a replacement for contamination hazard! Umm on tape recommendations, I use this product from Amazon:
SIMPATCH – Dexcom G6 Adhesive Patch (25-Pack) – Waterproof Adhesive, CGM Patches – Multiple Color Options https://www.amazon.com/dp/B07QGX3HJW/ref=cm_sw_r_cp_api_i_A554QPSVT59RGBYPFSE8
Cut it to the size you need with clean scissors… put on after insertion and ensure the tape covers over the white Dexcom tape.